Expanded Memory is a type of memory that can be added to IBM and personal compatible computers. The use of Expanded Memory is defined by the Expanded Memory Specification (EMS), which supports memory boards containing RAM that can be enabled or disabled by software. It is a technique for utilizing more than 1MB (megabyte) of main memory in DOS based computers. The limit of 1MB is built into the DOS operating system. The upper 384K is reserved for special purposes, leaving just 640K of conventional memory for programs. Applications had to be written in a specific way to access the expanded memory.
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